#!/bin/bash

#

# msnfs41client.bash - simple Cygwin frontent for the msnfsv41

# NFSv4.1 filesystem driver

#

#

# Written by Roland Mainz <roland.mainz@nrubsig.org>

#

#

# Examples:

#

# 1. Mount for current users:

# (requires PsExec from https://download.sysinternals.com/files/PSTools.zip

# in /home/roland_mainz/work/win_pstools/)

# * Usage:

# Shell1: cd /cygdrive/c/Users/roland_mainz/Downloads/ms-nfs41-client-x64/ms-nfs41-client-x64 && bash ../msnfs41client.bash run_deamon

# Shell2: cd /cygdrive/c/Users/roland_mainz/Downloads/ms-nfs41-client-x64/ms-nfs41-client-x64 && bash ../msnfs41client.bash mount_homedir

#

# 2. Mount for all users:

# * Requires:

# - Windows admin rights (Cygwin --> Run terminal as Adminstrator)

# - PsExec from https://download.sysinternals.com/files/PSTools.zip in /home/roland_mainz/work/win_pstools/)

# * Usage:

# Shell1: cd /cygdrive/c/Users/roland_mainz/Downloads/ms-nfs41-client-x64/ms-nfs41-client-x64 && bash ../msnfs41client.bash sys_run_deamon

# Shell2: cd /cygdrive/c/Users/roland_mainz/Downloads/ms-nfs41-client-x64/ms-nfs41-client-x64 && bash ../msnfs41client.bash sys_mount_homedir

#

function is_windows_admin_account

{

	#

	# Test whether we have the Windows permissions to install DLLs

	# and the kernel module

	#

	# Usually Windows Adminstrator rights are indicated by the

	# membership in group "544(Administratoren)" (Cygwin maps

	# "SID S-1-5-32-544" to GID 544)

	#

	if [[ "$(id -G)" =~ (^|[[:space:]]+)544([[:space:]]+|$) ]] ; then

		return 0

	fi

	return 1

}

function nfsclient_install

{

	set -o nounset

	set -o xtrace

	set -o errexit

	if ! is_windows_admin_account ; then

		printf $"%s: Install requires Windows Adminstator permissions.\n" "$0"

		return 1

	fi

	# make sure all binaries are executable, Windows cmd does

	# not care, but Cygwin&bash do.

	# If *.ddl are not executable nfs*.exe fail with 0xc0000022

	chmod a+x *.exe *.dll

	if false ; then

		# install.bat needs PATH to include $PWD

		PATH="$PWD:$PATH" cmd /c install.bat

	else

		nfs_install

		rundll32 setupapi.dll,InstallHinfSection DefaultInstall 132 ./nfs41rdr.inf

	fi

	mkdir -p /cygdrive/c/etc

	cp etc_netconfig /cygdrive/c/etc/netconfig

	cp ms-nfs41-idmap.conf /cygdrive/c/etc/.

	bcdedit /set testsigning on

	regtool -s set '/HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Tcpip/Parameters/Domain' 'GLOBAL.LOC'

	sc query Dfsc

	sc stop Dfsc || true

	sc config Dfsc start=disabled

	sc query nfs41_driver

	domainname

	# check whether the driver really has been installed

	md5sum \

		"$PWD/nfs41_driver.sys" \

		'/cygdrive/c/Windows/System32/drivers/nfs41_driver.sys'

	return 0

}

function nfsclient_rundeamon

{

	set -o xtrace

	set -o nounset

	return $?

}

function nfsclient_system_rundeamon

{

	set -o xtrace

	set -o nounset

	return $?

}

function nfsclient_mount_homedir

{

	set -o xtrace

	set -o nounset

	set -o errexit

	#nfs_mount -p -o sec=sys H 'derfwpc5131:/export/home/rmainz'

	# fixme: Specifying IPv6 addresses do not work yet, as soon as

	# they come as UNC paths (e.g.

	# $ cd '//[fe80::219:99ff:feae:73ce]@2049/nfs4/export/home/rmainz' #

	# they get corrupted once they arrive in nfsd_debug.exe)

	#nfs_mount -p -o sec=sys H '[fe80::219:99ff:feae:73ce]:/export/home/rmainz'

	nfs_mount -p -o sec=sys H 'derfwpc5131_ipv6:/export/home/rmainz'

	mkdir -p '/home/rmainz'

	mount -o bind,posix=1 '/cygdrive/h' '/home/rmainz'

	return $?

}

function nfsclient_system_mount_homedir

{

	set -o xtrace

	set -o nounset

	set -o errexit

	# purge any leftover persistent mappings to device H:

	su_system net use H: /delete || true

	#su_system nfs_mount -p -o sec=sys H 'derfwpc5131:/export/home/rmainz'

	# fixme: Specifying IPv6 addresses do not work yet, as soon as

	# they come as UNC paths (e.g.

	# $ cd '//[fe80::219:99ff:feae:73ce]@2049/nfs4/export/home/rmainz' #

	# they get corrupted once they arrive in nfsd_debug.exe)

	#su_system nfs_mount -p -o sec=sys H '[fe80::219:99ff:feae:73ce]:/export/home/rmainz'

	su_system nfs_mount -p -o sec=sys H 'derfwpc5131_ipv6:/export/home/rmainz'

	return $?

}

function nfsclient_umount_homedir

{

	set -o xtrace

	set -o nounset

	typeset -i res

	nfs_mount -d H

	(( res=$? ))

	if (( res == 0 )) ; then

		# remove bind mount

		umount '/home/rmainz' && rmdir '/home/rmainz'

	fi

	return $res

}

function require_cmd

{

	typeset cmd="$1"

	if ! which "$cmd" >'/dev/null' 2>&1 ; then

		printf $"%s: %q not found in %q\n" "$0" "$cmd" "$PWD" 1>&2

		return 1

	fi

	return 0

}

# execute cmd as Windows user "SYSTEM"

function su_system

{

	typeset cmd="$1"

	shift

	typeset abspath_cmd="$(which "$cmd")"

	if [[ ! -x "$abspath_cmd" ]] ; then

		printf "%s: Command %q not found." $"su_system" "$abspath_cmd" 1>&2

		return 127

	fi

	PsExec \

		-accepteula -nobanner \

		-s \

		-w "$(cygpath -w "$PWD")" \

		"$(cygpath -w "$abspath_cmd")" "$@"

}

function sys_terminal

{

	# su_system does not work, mintty requires PsExec -i

	PsExec -accepteula -nobanner \

		-i \

		-s -w "$(cygpath -w "$PWD")" \

		'C:\cygwin64\bin\mintty.exe'

}

function main

{

	typeset cmd="$1"

	# "$PATH:/usr/bin:/bin" is used for PsExec where $PATH might be empty

	export PATH="$PWD:$PATH:/usr/bin:/bin"

	# my own path to pstools

	PATH+=':/home/roland_mainz/work/win_pstools/'

	case "$cmd" in

		'install')

			nfsclient_install

			return $?

			;;

		'run_deamon' | 'run_daemon')

			require_cmd 'nfsd.exe' || return 1

			require_cmd 'nfsd_debug.exe' || return 1

			require_cmd 'nfs_mount.exe' || return 1

			nfsclient_rundeamon

			return $?

			;;

		'sys_run_deamon' | 'sys_run_daemon')

			require_cmd 'PsExec.exe' || return 1

			require_cmd 'nfsd.exe' || return 1

			require_cmd 'nfsd_debug.exe' || return 1

			require_cmd 'nfs_mount.exe' || return 1

			if ! is_windows_admin_account ; then

				printf $"%s: %q requires Windows Adminstator permissions.\n" "$0" "$cmd"

				return 1

			fi

			nfsclient_system_rundeamon

			return $?

			;;

		'sys_mount_homedir')

			require_cmd 'nfs_mount.exe' || return 1

			if ! is_windows_admin_account ; then

				printf $"%s: %q requires Windows Adminstator permissions.\n" "$0" "$cmd"

				return 1

			fi

			nfsclient_system_mount_homedir

			return $?

			;;

		'mount_homedir')

			require_cmd 'nfs_mount.exe' || return 1

			nfsclient_mount_homedir

			return $?

			;;

		'umount_homedir')

			require_cmd 'nfs_mount.exe' || return 1

			nfsclient_umount_homedir

			return $?

			;;

		# misc

		'sys_terminal')

			require_cmd 'mintty.exe' || return 1

			if ! is_windows_admin_account ; then

				printf $"%s: %q requires Windows Adminstator permissions.\n" "$0" "$cmd"

				return 1

			fi

			sys_terminal

			return $?

			;;

		*)

			printf $"%s: Unknown cmd %q\n" "$0" "$cmd" 1>&2

			return 1

			;;

	esac

	return 1

}

#

# main

#

main "$@"

exit $?

# EOF.